Well AC Infinity is good if your running CO2 bags or TNB Natural CO2 container cause the cloudline series has humidity and temperatures settings and will increase fan speed according to your settings. So when your in the range you want dan speed decreases automatically and your CO2 will be available more for plants to use. I use this 6” or a hurricane 6” for my 3x3. I have a lot of plants in there so when lights are off and plants transpires ALOT humidity goes up and since adding this specific exhaust fan I haven’t needed to add a dehumidifier it’s awesome